Space junk: What is it, how much is out there, and what should we do with it?

Australian scientists believe there are millions of artificial objects in orbit around the Earth, and that has huge implications for the safety of our satellites and spacecraft. With a war on galactic waste to be declared at the International Astronautical Congress in Adelaide, we take a look at this enormous mess. What is space junk? It's essentially the debris left behind by human exploration and activity in the Earth's orbit — old satellites, pieces of spent rockets, waste from astronaut suits and other items left behind during space walks. More

(Source: ABC Online - Sep 23)